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    Hello,

    I have a frequency-domain signal and will do a reverse fourier transform to get it in the time domain. there's a feature I'm interested in and I know where it is in the frequency domain (ie, which characteristic frequency the event happens at), I was wondering how I get that feature in the time domain.

    Kind regards.
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    (Original post by x345)
    Hello,

    I have a frequency-domain signal and will do a reverse fourier transform to get it in the time domain. there's a feature I'm interested in and I know where it is in the frequency domain (ie, which characteristic frequency the event happens at), I was wondering how I get that feature in the time domain.

    Kind regards.
    Your question is too vague to have a unique answer (or maybe I don't understand it properly)

    If your frequency domain signal is a single spike, say, then the "feature" is a sine wave in the time domain, which you can then point at.

    If your time domain signal is a repetitive square wave, then its FT will be a bunch of discrete frequencies, whose amplitudes can be computed from Fourier analysis. But there is now no one-to-one correspondence between part of the frequency domain, and what you will see in the time domain.
 
 
 
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